EP 0924717 A3 19991124 - Rare earth-iron-boron permanent magnet and method for the preparation thereof
Title (en)
Rare earth-iron-boron permanent magnet and method for the preparation thereof
Title (de)
Seltener Eisen-Bor-Dauermagnet und Herstellungsverfahren
Title (fr)
Aimant permanent à base de terre rare-fer-bore et procédé de fabrication
Publication
Application
Priority
JP 35275897 A 19971222
Abstract (en)
[origin: EP0924717A2] Disclosed is a method for the preparation of a novel composite rare earth-based magnetically anisotropic sintered permanent magnet in which: (a) a base alloy consisting of a host phase of R2T14B (R: a rare earth element; T: iron or a combination of iron and cobalt) having a particle diameter of 2 to 10 mu m and containing in each particle a phase rich in the content of T and having a particle diameter not exceeding 1 mu m is prepared by the strip casting method; (b) the base alloy is crushed; (c) the base alloy powder is blended in a specified proportion with a powder of an auxiliary alloy of R-T or R-T-B in a specified proportion; (d) the powder blend is subjected to further comminution; (e) the comminuted powder blend is subjected to compression-molding in a magnetic field into a powder compact; and (f) the powder compact is sintered by a heat treatment.
IPC 1-7
IPC 8 full level
C22C 33/02 (2006.01); C22C 38/00 (2006.01); H01F 1/053 (2006.01); H01F 1/057 (2006.01); H01F 1/08 (2006.01); H01F 41/02 (2006.01)
CPC (source: EP US)
B82Y 25/00 (2013.01 - EP US); H01F 1/0577 (2013.01 - EP US); H01F 1/0579 (2013.01 - EP US)
Citation (search report)
- [YA] WO 9215995 A1 19920917 - BASF AG [DE]
- [YA] PATENT ABSTRACTS OF JAPAN vol. 199, no. 506 31 July 1995 (1995-07-31)
- [A] PATENT ABSTRACTS OF JAPAN vol. 199, no. 506 31 July 1995 (1995-07-31)
- [A] PATENT ABSTRACTS OF JAPAN vol. 199, no. 506 31 July 1995 (1995-07-31)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
EP 0924717 A2 19990623; EP 0924717 A3 19991124; EP 0924717 B1 20031119; DE 69819854 D1 20031224; DE 69819854 T2 20041104; JP 3549382 B2 20040804; JP H11186016 A 19990709; US 5930582 A 19990727
DOCDB simple family (application)
EP 98310388 A 19981217; DE 69819854 T 19981217; JP 35275897 A 19971222; US 21720798 A 19981222